176339 Croom, F. H. (1989). Principles of topology. Philadelphia : Saunders College.
Cita Chicago (17th ed.)176339 Croom, Fred H. Principles of Topology. Philadelphia : Saunders College, 1989.
Cita MLA (9th ed.)176339 Croom, Fred H. Principles of Topology. Philadelphia : Saunders College, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.